Basic Fire Door Requirements

Date:Sep 30, 2019


The fire rating classification of the wall into
which the door is installed dictates the required
fire rating of the door. The location of the wall in
the building and prevailing building code establish the wall’s fire rating. The associated door
ratings are shown in table 1 below

2.1 Hourly ratings
Steel fire doors are “rated” by time (in minutes
or hours) that a door can withstand exposure
to fire test conditions. Hourly ratings include
1-1/2-hours, 1-hour, 3/4-hour, and 1/3-hour,
with the maximum rating required of any swinging type fire door being three hours.
2.2 Three-hour (180 minute) doors
A door with a three-hour fire protection rating is usually found in walls that separate
buildings or that divide a large building into
smaller fire areas. The wall rating is four
2.3 1-1/2-hour (90 minute) doors
Doors rated for 1-1/2 hours are found in 2-hour
rated walls. These doors are commonly located in stairwells, or other enclosures of vertical communication through a building. They
also occur in boiler rooms and in exterior walls
that have potential for severe fire exposure
from the outside the building.

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